FETAL PERIOD

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WEEK 27 Gestational age: 26 weeks old. Embryonic age: Week numbers 25. 24 weeks old. The fetus reaches a length of 38 cm (15 inches). The fetus weighs about 1.2 kg (2 lb 11 oz). The brain develops rapidly. The nervous system develops enough to control some body functions. The eyelids open and close. The cochleae are now developed, though the myelin sheaths in neural portion of the auditory system will continue to develop until 18 months after birth. The respiratory system, while immature, has developed to the point where gas exchange is possible. WEEK 31 Gestational age: 30 weeks old. Embryonic age: Week numbers 29. 28 weeks old.
The fetus reaches a length of about 38–43 cm (15– 17 inches). The fetus weighs about 2 kg (3 lb 0 oz). The amount of body fat rapidly increases. Rhythmic breathing movements occur, but lungs are not fully mature. Thalamic brain connections, which mediate sensory input, form. Bones are fully developed, but are still soft and pliable. The fetus begins storing iron, calcium, and phosphorus. WEEK 35 Gestational age: 34 weeks old. Embryonic age: Week numbers 33. 32 weeks old. The fetus reaches a length of about 40–48 cm (16– 19 inches). The fetus weighs about 2.5 to 3 kg (5 lb 12 oz to 6 lb 12 oz). Lanugo begins to disappear. Body fat increases. Fingernails reach the end of the fingertips. A baby born at 36 weeks has a high chance of survival, but may require medical interventions.
Page 1 and 2: FETAL PERIOD (9 th WEEK TILL BIRTH)
Page 3 and 4: WEEKS 10-12 Gestational age: 9-11
Page 5: Lanugo covers the entire body. Eye
Page 9 and 10: All major structures are already fo
Page 11 and 12: EXTERNAL GENITALIA The external ge
Page 13: In the third trimester bone marrow

FETAL PERIOD

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